blob: 4f130ce20ca5b044dc04647593c4840674e33c52 [file] [log] [blame]
/*
* Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <libfdt.h>
#include <platform_def.h>
#include <common/debug.h>
#include <common/fdt_wrappers.h>
#include <drivers/st/stm32_gpio.h>
#include <drivers/st/stm32mp1_ddr.h>
#include <drivers/st/stm32mp1_ram.h>
#include <stm32mp_dt.h>
static int fdt_checked;
static void *fdt = (void *)(uintptr_t)STM32MP_DTB_BASE;
/*******************************************************************************
* This function checks device tree file with its header.
* Returns 0 on success and a negative FDT error code on failure.
******************************************************************************/
int dt_open_and_check(void)
{
int ret = fdt_check_header(fdt);
if (ret == 0) {
fdt_checked = 1;
}
return ret;
}
/*******************************************************************************
* This function gets the address of the DT.
* If DT is OK, fdt_addr is filled with DT address.
* Returns 1 if success, 0 otherwise.
******************************************************************************/
int fdt_get_address(void **fdt_addr)
{
if (fdt_checked == 1) {
*fdt_addr = fdt;
}
return fdt_checked;
}
/*******************************************************************************
* This function check the presence of a node (generic use of fdt library).
* Returns true if present, else return false.
******************************************************************************/
bool fdt_check_node(int node)
{
int len;
const char *cchar;
cchar = fdt_get_name(fdt, node, &len);
return (cchar != NULL) && (len >= 0);
}
/*******************************************************************************
* This function return global node status (generic use of fdt library).
******************************************************************************/
uint8_t fdt_get_status(int node)
{
uint8_t status = DT_DISABLED;
const char *cchar;
cchar = fdt_getprop(fdt, node, "status", NULL);
if ((cchar == NULL) ||
(strncmp(cchar, "okay", strlen("okay")) == 0)) {
status |= DT_NON_SECURE;
}
cchar = fdt_getprop(fdt, node, "secure-status", NULL);
if (cchar == NULL) {
if (status == DT_NON_SECURE) {
status |= DT_SECURE;
}
} else if (strncmp(cchar, "okay", strlen("okay")) == 0) {
status |= DT_SECURE;
}
return status;
}
#if ENABLE_ASSERTIONS
/*******************************************************************************
* This function returns the address cells from the node parent.
* Returns:
* - #address-cells value if success.
* - invalid value if error.
* - a default value if undefined #address-cells property as per libfdt
* implementation.
******************************************************************************/
static int fdt_get_node_parent_address_cells(int node)
{
int parent;
parent = fdt_parent_offset(fdt, node);
if (parent < 0) {
return -FDT_ERR_NOTFOUND;
}
return fdt_address_cells(fdt, parent);
}
#endif
/*******************************************************************************
* This function gets the stdout pin configuration information from the DT.
* And then calls the sub-function to treat it and set GPIO registers.
* Returns 0 on success and a negative FDT error code on failure.
******************************************************************************/
int dt_set_stdout_pinctrl(void)
{
int node;
node = fdt_get_stdout_node_offset(fdt);
if (node < 0) {
return -FDT_ERR_NOTFOUND;
}
return dt_set_pinctrl_config(node);
}
/*******************************************************************************
* This function fills the generic information from a given node.
******************************************************************************/
void dt_fill_device_info(struct dt_node_info *info, int node)
{
const fdt32_t *cuint;
assert(fdt_get_node_parent_address_cells(node) == 1);
cuint = fdt_getprop(fdt, node, "reg", NULL);
if (cuint != NULL) {
info->base = fdt32_to_cpu(*cuint);
} else {
info->base = 0;
}
cuint = fdt_getprop(fdt, node, "clocks", NULL);
if (cuint != NULL) {
cuint++;
info->clock = (int)fdt32_to_cpu(*cuint);
} else {
info->clock = -1;
}
cuint = fdt_getprop(fdt, node, "resets", NULL);
if (cuint != NULL) {
cuint++;
info->reset = (int)fdt32_to_cpu(*cuint);
} else {
info->reset = -1;
}
info->status = fdt_get_status(node);
}
/*******************************************************************************
* This function retrieve the generic information from DT.
* Returns node on success and a negative FDT error code on failure.
******************************************************************************/
int dt_get_node(struct dt_node_info *info, int offset, const char *compat)
{
int node;
node = fdt_node_offset_by_compatible(fdt, offset, compat);
if (node < 0) {
return -FDT_ERR_NOTFOUND;
}
dt_fill_device_info(info, node);
return node;
}
/*******************************************************************************
* This function gets the UART instance info of stdout from the DT.
* Returns node on success and a negative FDT error code on failure.
******************************************************************************/
int dt_get_stdout_uart_info(struct dt_node_info *info)
{
int node;
node = fdt_get_stdout_node_offset(fdt);
if (node < 0) {
return -FDT_ERR_NOTFOUND;
}
dt_fill_device_info(info, node);
return node;
}
/*******************************************************************************
* This function gets DDR size information from the DT.
* Returns value in bytes on success, and 0 on failure.
******************************************************************************/
uint32_t dt_get_ddr_size(void)
{
int node;
node = fdt_node_offset_by_compatible(fdt, -1, DT_DDR_COMPAT);
if (node < 0) {
INFO("%s: Cannot read DDR node in DT\n", __func__);
return 0;
}
return fdt_read_uint32_default(fdt, node, "st,mem-size", 0);
}
/*******************************************************************************
* This function gets PWR VDD regulator voltage information from the DT.
* Returns value in microvolts on success, and 0 on failure.
******************************************************************************/
uint32_t dt_get_pwr_vdd_voltage(void)
{
int node, pwr_regulators_node;
const fdt32_t *cuint;
node = fdt_node_offset_by_compatible(fdt, -1, DT_PWR_COMPAT);
if (node < 0) {
INFO("%s: Cannot read PWR node in DT\n", __func__);
return 0;
}
pwr_regulators_node = fdt_subnode_offset(fdt, node, "pwr-regulators");
if (pwr_regulators_node < 0) {
INFO("%s: Cannot read pwr-regulators node in DT\n", __func__);
return 0;
}
cuint = fdt_getprop(fdt, pwr_regulators_node, "vdd-supply", NULL);
if (cuint == NULL) {
return 0;
}
node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint));
if (node < 0) {
return 0;
}
cuint = fdt_getprop(fdt, node, "regulator-min-microvolt", NULL);
if (cuint == NULL) {
return 0;
}
return fdt32_to_cpu(*cuint);
}
/*******************************************************************************
* This function retrieves board model from DT
* Returns string taken from model node, NULL otherwise
******************************************************************************/
const char *dt_get_board_model(void)
{
int node = fdt_path_offset(fdt, "/");
if (node < 0) {
return NULL;
}
return (const char *)fdt_getprop(fdt, node, "model", NULL);
}
/*******************************************************************************
* This function gets the pin count for a GPIO bank based from the FDT.
* It also checks node consistency.
******************************************************************************/
int fdt_get_gpio_bank_pin_count(unsigned int bank)
{
int pinctrl_node;
int node;
uint32_t bank_offset;
pinctrl_node = stm32_get_gpio_bank_pinctrl_node(fdt, bank);
if (pinctrl_node < 0) {
return -FDT_ERR_NOTFOUND;
}
bank_offset = stm32_get_gpio_bank_offset(bank);
fdt_for_each_subnode(node, fdt, pinctrl_node) {
const fdt32_t *cuint;
if (fdt_getprop(fdt, node, "gpio-controller", NULL) == NULL) {
continue;
}
cuint = fdt_getprop(fdt, node, "reg", NULL);
if (cuint == NULL) {
continue;
}
if (fdt32_to_cpu(*cuint) != bank_offset) {
continue;
}
if (fdt_get_status(node) == DT_DISABLED) {
return 0;
}
cuint = fdt_getprop(fdt, node, "ngpios", NULL);
if (cuint == NULL) {
return -FDT_ERR_NOTFOUND;
}
return (int)fdt32_to_cpu(*cuint);
}
return 0;
}